All categories
Miniature Circuit Breakers (MCBs)
Miniature Circuit Breakers (MCBs) - Schneider Electric
An MCB is an automatically operated electrical switch. Miniature circuit breakers are intended to prevent damage to an electrical circuit as a result of excess current.
Found 85 products
Square D by Schneider Electric QOU2801021 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a shunt trip coil, facilitating remote tripping of the breaker. This MCB is rated for 80A and can accommodate connections via slotted box lugs on both the load and line sides. It is compatible with a cross-section of 12-2/0AWG for one aluminum or copper cable. The QOU2801021 is a 2-pole breaker, suitable for systems with rated voltages of 60Vdc and 120V/240Vac. It operates within a control voltage range of 120Vac to 208Vac. The short circuit breaking rating stands at 10kA for 240Vac systems and 5kA for 60Vdc systems. The terminals are designed as box lugs, ensuring a secure connection.
Quick Quote
Square D by Schneider Electric QOU235VH is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 35A and accommodates slotted box lugs connections on both the load and line sides. This MCB operates at a rated voltage of 120V to 240V AC and is compatible with a cross-section of 14-2AWG for one aluminum or copper cable. It is a 2-pole device with a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are box lugs type, facilitating secure and straightforward connections.
Quick Quote
Square D by Schneider Electric QOU2303100 is a unit-mount Miniature Circuit Breaker (MCB) designed for a variety of applications. It features a 2-pole configuration and is capable of handling a rated current of 30A. This MCB is equipped with slotted box lugs connections for both load and line sides, accommodating a cross-section of 14-2AWG (1 cable Al/Cu). It operates at a rated voltage of 120V to 240V AC and 48V DC, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are designed as box lugs, facilitating secure and reliable connections.
Quick Quote
Square D by Schneider Electric QOB3100Z is a Miniature Circuit Breaker (MCB) designed for bolt-on mounting. It features a bolt-on connection type and is equipped with 3 poles. This MCB is rated for a current of 100A and supports a voltage rating of 120 V to 240 V AC.
Quick Quote
Square D by Schneider Electric QOB225SWN1021 is a miniature circuit breaker (MCB) designed with a switch-neutral function and an integrated shunt trip coil. It features a bolt-on mounting mode and a bolt-on connection type, ensuring secure installation. This MCB is rated for a current of 25A and operates at a rated voltage of 120V AC. It accommodates a cross-section of 14-8AWG for one aluminum or copper cable and is equipped with two poles. The control voltage ranges from 120Vac to 208Vac. It has a short circuit breaking rating of 10kA at 120Vac and utilizes press plate type terminals for connections.
Quick Quote
Schneider Electric M9F53345 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed to comply with UL489 standards. It features a 3-pole configuration and is rated for a current of 45A. The MCB has a rated insulation voltage (Ui) of 500 V and a rated impulse voltage (Uimp) of 6 kV. It offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 125Vdc. The rated voltage (AC) for phase-to-phase connections is 440 V, with all three poles protected. It operates with a D tripping curve.
Quick Quote
Schneider Electric M9F53263 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed with a 2 Pole configuration and a rated current of 63A. It features a rated insulation voltage (Ui) of 500 V and a rated impulse voltage (Uimp) of 6 kV. This MCB offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 125Vdc, with a rated voltage (AC) for phase-to-phase connections at 440 V. Both poles are protected, and it operates with a D tripping curve.
Quick Quote
Schneider Electric M9F53150 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed for a single-pole configuration. It features a rated current of 50A and is compliant with UL489 standards. The MCB has a rated insulation voltage (Ui) of 500V and a rated impulse voltage (Uimp) of 6kV. It offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 60Vdc. The rated voltage (AC) for phase-to-phase connections is 440V, with one protected pole. It operates with a D tripping curve.
Quick Quote
Schneider Electric M9F53145 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed for a single pole configuration. It features a rated current of 45A and is compliant with UL489 standards. The MCB has a rated insulation voltage (Ui) of 500 V and a rated impulse voltage (Uimp) of 6 kV. It offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 60Vdc. The rated voltage (AC) for phase-to-phase connections is 440 V, with one protected pole. It operates with a D tripping curve.
Quick Quote
Schneider Electric M9F23463 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed with a 4 Pole configuration and a rated current of 63A. It features a short circuit breaking rating of 14kA AIR at 240Vac and 10kA AIR at 480Y/277Vac. All four poles are protected, and it operates with a D tripping curve. This MCB is compliant with UL1077 standards.
Quick Quote
| Item | Manufacturer | Price | Stock | Delivery | |
|---|---|---|---|---|---|
QOU2801021 Square D by Schneider Electric QOU2801021 is a miniature circuit breaker (MCB) designed for unit mount installation. It features a shunt trip coil, facilitating remote tripping of the breaker. This MCB is rated for 80A and can accommodate connections via slotted box lugs on both the load and line sides. It is compatible with a cross-section of 12-2/0AWG for one aluminum or copper cable. The QOU2801021 is a 2-pole breaker, suitable for systems with rated voltages of 60Vdc and 120V/240Vac. It operates within a control voltage range of 120Vac to 208Vac. The short circuit breaking rating stands at 10kA for 240Vac systems and 5kA for 60Vdc systems. The terminals are designed as box lugs, ensuring a secure connection. | Schneider Electric | Quick Quote | |||
QOU235VH Square D by Schneider Electric QOU235VH is a miniature circuit breaker (MCB) designed for unit mount installation. It features a rated current of 35A and accommodates slotted box lugs connections on both the load and line sides. This MCB operates at a rated voltage of 120V to 240V AC and is compatible with a cross-section of 14-2AWG for one aluminum or copper cable. It is a 2-pole device with a short circuit breaking rating of 22kA at 240Vac and 5kA at 48Vdc. The terminals are box lugs type, facilitating secure and straightforward connections. | Schneider Electric | Quick Quote | |||
QOU2303100 Square D by Schneider Electric QOU2303100 is a unit-mount Miniature Circuit Breaker (MCB) designed for a variety of applications. It features a 2-pole configuration and is capable of handling a rated current of 30A. This MCB is equipped with slotted box lugs connections for both load and line sides, accommodating a cross-section of 14-2AWG (1 cable Al/Cu). It operates at a rated voltage of 120V to 240V AC and 48V DC, with a short circuit breaking rating of 10kA at 240Vac and 5kA at 48Vdc. The terminals are designed as box lugs, facilitating secure and reliable connections. | Schneider Electric | Quick Quote | |||
QOB3100Z Square D by Schneider Electric QOB3100Z is a Miniature Circuit Breaker (MCB) designed for bolt-on mounting. It features a bolt-on connection type and is equipped with 3 poles. This MCB is rated for a current of 100A and supports a voltage rating of 120 V to 240 V AC. | Schneider Electric | Quick Quote | |||
QOB225SWN1021 Square D by Schneider Electric QOB225SWN1021 is a miniature circuit breaker (MCB) designed with a switch-neutral function and an integrated shunt trip coil. It features a bolt-on mounting mode and a bolt-on connection type, ensuring secure installation. This MCB is rated for a current of 25A and operates at a rated voltage of 120V AC. It accommodates a cross-section of 14-8AWG for one aluminum or copper cable and is equipped with two poles. The control voltage ranges from 120Vac to 208Vac. It has a short circuit breaking rating of 10kA at 120Vac and utilizes press plate type terminals for connections. | Schneider Electric | Quick Quote | |||
M9F53345 Schneider Electric M9F53345 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed to comply with UL489 standards. It features a 3-pole configuration and is rated for a current of 45A. The MCB has a rated insulation voltage (Ui) of 500 V and a rated impulse voltage (Uimp) of 6 kV. It offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 125Vdc. The rated voltage (AC) for phase-to-phase connections is 440 V, with all three poles protected. It operates with a D tripping curve. | Schneider Electric | Quick Quote | |||
M9F53263 Schneider Electric M9F53263 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed with a 2 Pole configuration and a rated current of 63A. It features a rated insulation voltage (Ui) of 500 V and a rated impulse voltage (Uimp) of 6 kV. This MCB offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 125Vdc, with a rated voltage (AC) for phase-to-phase connections at 440 V. Both poles are protected, and it operates with a D tripping curve. | Schneider Electric | Quick Quote | |||
M9F53150 Schneider Electric M9F53150 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed for a single-pole configuration. It features a rated current of 50A and is compliant with UL489 standards. The MCB has a rated insulation voltage (Ui) of 500V and a rated impulse voltage (Uimp) of 6kV. It offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 60Vdc. The rated voltage (AC) for phase-to-phase connections is 440V, with one protected pole. It operates with a D tripping curve. | Schneider Electric | Quick Quote | |||
M9F53145 Schneider Electric M9F53145 is a Miniature Circuit Breaker (MCB) within the C60BPR sub-range, designed for a single pole configuration. It features a rated current of 45A and is compliant with UL489 standards. The MCB has a rated insulation voltage (Ui) of 500 V and a rated impulse voltage (Uimp) of 6 kV. It offers a short circuit breaking rating of 10kA AIR at 120Vac, 240Vac, and 60Vdc. The rated voltage (AC) for phase-to-phase connections is 440 V, with one protected pole. It operates with a D tripping curve. | Schneider Electric | Quick Quote | |||
M9F23463 Schneider Electric M9F23463 is a Miniature Circuit Breaker (MCB) within the C60SP sub-range, designed with a 4 Pole configuration and a rated current of 63A. It features a short circuit breaking rating of 14kA AIR at 240Vac and 10kA AIR at 480Y/277Vac. All four poles are protected, and it operates with a D tripping curve. This MCB is compliant with UL1077 standards. | Schneider Electric | Quick Quote | |||
Miniature Circuit Breakers (MCBs)
General Guide & Overview
Welcome to our comprehensive guide on miniature circuit breakers (MCBs). Whether you're an electrical professional or simply interested in understanding the inner workings of your home's electrical system, this article will provide you with all the information you need about MCBs.
MCBs are vital components of electrical systems, offering crucial protection against overloads and short circuits. Unlike traditional fuses, MCBs are automatic switches that respond to changes in current flow. This innovative technology not only enhances safety but also improves convenience for users.
In this guide, we will explore how MCBs work, the different types available, and the advantages they offer. So let's dive in and unlock the mysteries behind these essential electrical devices.
How Does a Miniature Circuit Breaker Work?
A miniature circuit breaker (MCB) is a vital component of an electrical system, designed to protect against overloads and short circuits. Understanding how an MCB works can help you ensure the safety and efficiency of your electrical installations.
MCBs operate by utilizing two types of tripping mechanisms: thermal tripping and magnetic tripping.
Thermal Tripping
Thermal tripping is the primary mechanism in MCBs. It detects and responds to excessive heat caused by an overload in the circuit. Inside the MCB, there is a bimetallic strip made of two different metals with different expansion coefficients. When the current passing through the MCB exceeds its rated capacity, the bimetallic strip heats up, causing the metals to expand at different rates. As a result, the strip bends and activates the trip mechanism, opening the contacts to interrupt the current flow.
Magnetic Tripping
Magnetic tripping is a secondary mechanism in MCBs. It provides rapid protection against short circuits by detecting strong current surges. Inside the MCB, there is an electromagnetic coil surrounding the current-carrying contacts. When a short circuit occurs, an extremely high current flows through the coil, generating a magnetic field that attracts the armature. The armature then trips the mechanism, opening the contacts and isolating the faulty circuit from the power supply.
The integration of both thermal and magnetic tripping mechanisms allows MCBs to provide reliable protection against a wide range of electrical faults. By quickly detecting and responding to abnormal current conditions, MCBs help prevent damage to electrical equipment, reduce the risk of electrical fires, and ensure the uninterrupted supply of electricity.
Advantages and Application of Miniature Circuit Breakers (MCBs)
Miniature circuit breakers (MCBs) provide a host of advantages compared to traditional fuses. One key advantage is their high responsiveness to changes in current flow, enabling swift and effective protection against overloads and short circuits. With MCBs, you can ensure that your electrical system remains safe and reliable.
MCBs are designed with a trip-free switching mechanism that instantly cuts off power in the event of an overload. This feature enhances the safety of your electrical circuits, preventing any potential damage or hazards. Additionally, MCBs are incredibly user-friendly, offering ease of installation and operation.
Another advantage of MCBs is the wide variety of models available, catering to different application requirements. Whether you need a specific current rating, breaking capacity, or fault protection characteristics, there is an MCB type that suits your needs. This flexibility allows for customization and ensures optimal performance, making MCBs a versatile choice for various electrical systems and applications.
FAQ
What is a miniature circuit breaker (MCB)?
A miniature circuit breaker (MCB) is an important component of an electrical system that provides protection against overloads and short circuits. Unlike traditional fuses, MCBs are automatic switches that open and close in response to changes in current flow, offering improved safety and convenience.
How does a miniature circuit breaker (MCB) work?
A miniature circuit breaker (MCB) works by using two types of tripping mechanisms: thermal tripping and magnetic tripping. Thermal tripping responds to excessive heat caused by an overload, while magnetic tripping responds to sudden increases in current flow caused by a short circuit.
What are the advantages of using miniature circuit breakers (MCBs)?
Miniature circuit breakers (MCBs) offer several advantages over traditional fuses. They are highly responsive to changes in current flow and provide reliable protection against overloads and short circuits. MCBs are easy to use, with a trip-free switching mechanism that instantly shuts off power in the event of an overload. They also have a wide range of models available, allowing for customization based on specific application requirements.